查看ESP32 JTAG的源代码

=== Debug ===

Open a bash window and run:

<source lang=bash>
$ cd /path/to/openocd-esp32
$ sudo ./src/openocd -s ./tcl -f $IDF_PATH/docs/quantum.cfg 
Open On-Chip Debugger 0.10.0-dev-g3098897-dirty (2016-11-06-00:39)
Licensed under GNU GPL v2
For bug reports, read
	http://openocd.org/doc/doxygen/bugs.html
adapter speed: 200 kHz
force hard breakpoints
Info : clock speed 200 kHz
Info : JTAG tap: esp32.cpu0 tap/device found: 0x120034e5 (mfg: 0x272 (Tensilica), part: 0x2003, ver: 0x1)
Info : JTAG tap: esp32.cpu1 tap/device found: 0x120034e5 (mfg: 0x272 (Tensilica), part: 0x2003, ver: 0x1)
</source>

Push the reset buttom on the Quantum board, you can see the openocd output:

<source lang=bash>
Info : esp32.cpu0: Debug controller was reset (pwrstat=0xFF, after clear 0xFF).
Info : esp32.cpu0: Core was reset (pwrstat=0xFF, after clear 0xFF).
Info : esp32.cpu1: Debug controller was reset (pwrstat=0xFF, after clear 0xFF).
Info : esp32.cpu1: Core was reset (pwrstat=0xFF, after clear 0xFF).
Info : esp32.cpu0: Target halted, pc=0x400809C4
esp32.cpu0: target state: halted                                 <---------- JTAG is OK otherwise reset the board again
</source>

ESP32 is enter JTAG debug mode now.


Open a new bash window and run:

<source lang=bash>
$ cd /path/to/esp-idf/examples/06_wifi_scan
$ xtensa-esp32-elf-gdb build/app-template.elf
GNU gdb (crosstool-NG 8d95cad) 7.10
Copyright (C) 2015 Free Software Foundation, Inc.
......
......
Reading symbols from build/wifi-scan.elf...done.
(gdb) tar remo localhost:3333
Remote debugging using localhost:3333
ipc_task (arg=0x0) at /work/xwifi/esp-idf/components/esp32/./ipc.c:45
45	{
(gdb) i r
pc             0x400809c4	0x400809c4 <ipc_task>
lbeg           0x0	0
lend           0x0	0
lcount         0x0	0
sar            0x0	0
ps             0x50020	327712
threadptr      0x0	0
br             0x0	0
scompare1      0x0	0
acclo          0x0	0
acchi          0x0	0
m0             0x0	0
m1             0x0	0
m2             0x0	0
m3             0x0	0
expstate       0x0	0
f64r_lo        0x0	0
f64r_hi        0x0	0
f64s           0x0	0
fcr            0x0	0
fsr            0x0	0
a0             0x0	0
a1             0x3ffc1580	1073485184
a2             0x0	0
a3             0x0	0
......
......
(gdb) b app_main
Breakpoint 1 at 0x400d1af8: file /work/xwifi/esp-idf/examples/06_wifi_scan/main/./app_main.c, line 64.
(gdb) c
Continuing.
esp32.cpu0: Target halted, pc=0x400D1AF8
[New Thread 1073491756]
[New Thread 1073493740]
[New Thread 1073485304]
[Switching to Thread 1073489792]

Breakpoint 1, app_main () at /work/xwifi/esp-idf/examples/06_wifi_scan/main/./app_main.c:64
64	{
(gdb) i thr
  Id   Target Id         Frame 
  4    Thread 1073485304 (No Name) 0x400820f6 in xQueueGenericReceive (xQueue=0x3ffc1054, pvBuffer=0x0, xTicksToWait=4294967295, 
    xJustPeeking=0) at /work/xwifi/esp-idf/components/freertos/./queue.c:1589
  3    Thread 1073493740 (Svc) 0x40083b52 in prvProcessTimerOrBlockTask (xNextExpireTime=0, xListWasEmpty=<optimized out>)
    at /work/xwifi/esp-idf/components/freertos/./timers.c:487
  2    Thread 1073491756 (No Name) prvIdleTask (pvParameters=0x0) at /work/xwifi/esp-idf/components/freertos/./tasks.c:3220
* 1    Thread 1073489792 (No Name : Running) app_main () at /work/xwifi/esp-idf/examples/06_wifi_scan/main/./app_main.c:64
</source>

Welcome to GDB world :)

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